Triethylamine → N'-(3-Bromophenyl)tetrahydro-2H-thiopyran-4-carbohydrazide

참여 물질

반응 단계

Oxalyl chloride (1.20 mL, 14.2 mmol) was added dropwise to a stirred solution of tetrahydro-2H-thiopyran-4-carboxylic acid (WO2007006732, 2.00 g, 13.7 mmol) in dichloromethane (25 mL). Then, two drops of N,N′-dimethylformamide were added and stirring was continued. After 1.5 hours, the resultant solution was added dropwise over 30 minutes to a stirred, cooled (ice-bath) solution of (3-bromophenyl)hydrazine hydrochloride (3.05 g, 13.7 mmol) and triethylamine (4.20 mL, 30.1 mmol) in dichloromethane (40 mL). After the addition, the mixture was warmed to room temperature and stirred for two hours. The mixture was then concentrated in vacuo and the residue was partitioned between ethyl acetate and water. The organic layer was washed with 4% aqueous sodium hydrogen carbonate solution, dried (MgSO4) and evaporated. The residue was triturated with diethyl ether and the solid was filtered and dried to give the title compound (2.57 g, 60%) as an off-white solid.

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